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"' Mr. Bill Rucker W8396 <br /> 25 Septembsr 1992 Paps 5 <br /> - R�eomrtand�d BuYdinO Envelopas <br /> One poal of our sits axploration work was to identify available buildable areas at the site for proposed <br /> residential devslopmant. Site selection in areac with critical slopes is often a compromise between <br /> conservativs sita ssleetion wiM lower enpineerinp and construction costs and devetopment closer to <br /> eritiwl slopes with thorouph slope stability evaluationc and attendant hipher desipn and construction <br /> costc. Tha locetions recommended for buildinp development at thia site were based on appropriately <br /> conservadvs evaluations piven the relatively limited nature of the site atudy. The buildinp envelopes <br /> -• indicated on our Sits and Exploration Plan, Flpure 1, should provids adequate support for tha new <br /> homes durinp their desipn life, in our opinion, provided that the recommendations in thia report are <br /> .., incorporated into project desipn, construction, and maintenance. If buildinp sites are desired closer to <br /> the critical stopes on the property , viable alternatives may be developed based on a more deuiled <br /> enpineerinp analysis. A more deUiled analysis would include a more riporous site investipation usinp <br /> portable drillinp equipment, laboratory testinp, and a slope stability analysis. The resulu of such a <br /> work phase would includs enpineerinp solutions that would provide adequate factors of satety for <br /> � foundations�Item�avea nearer to critical slopes.Such sltemativea may include foundin0 structurea on <br /> � � ' deep pilinp or subilization of the slopa, or a combination of both, and may or may not be considered <br /> S � � economically feesible to implement for residential construction. <br /> � , <br /> , , The recommended buildinp envelopes shown on our Site and Exploration Plan are based on our site <br /> . expioration, aoss-sectional drawinps developed by us based on a site survey by Lee Johnson and <br /> Associates dated July 1969 by professional surveyor Howard Espesth, provided by Mr. Rucker, and <br /> our experience with similar soil and site conditions. The recommended envelopes incorporate a setback <br /> fro�n tha tops of adjacent critical site slopes. Due to the aDe of the available topoprophic survey, the <br /> actual pround surtace topopraphy at the site may not be accurately represented as it is likely that slope <br /> ' movements have occurted since preparation of the survey. Therefora, the buildinp envelopes <br /> , presented in this report should be used for preliminary planninp and conceptuai daipn purposes only. <br /> . We recommend that a curcent survey be developed prior to aetual construction, incorporatinp at least <br /> the buildinp envelopes and some of the surroundinp area. The survey should be provided to our firm <br /> for review of the recommended buildinp envelopes. Should sipnificant chanpes in topopraphy be <br /> detected, modi�cation of our recommended buildinp envelopes may be required. Buildinp sites should <br /> � encroach no cioser than 75 feet from the tops of critical slopes and should not extend beyond a 2H:1 V <br /> ` (Horizontal:Vertical) Oradient line projected upward from the toe of the slope. <br /> � L, AGRA <br /> Earth&Environmenral Group <br />